Unable to connect to database "target_db"

1. Check to see if Mysql is running
   
2. Make sure the Database "target_db" exists
   
3. The Database "target_db" is defined in file config.inc.php
   
4. Make sure the USERNAME defined in the config.inc.php can connect to the Database "target_db"
   
5. You Can create the Database "target_db" using file project_db.sql
   example: mysql -uroot -p < project_db.sql